JP6878879B2 - Packaging bag - Google Patents

Description

The present invention relates to a packaging bag in which no cut pieces are generated when the bag is opened.

Conventionally, packaging bags using a laminate containing a plastic film have been used in various forms such as a three-way seal type, a four-way seal type, a gassho seal type, and a self-standing type. The laminate is mainly composed of a base material layer, an intermediate layer, and a heat-sealing layer, and is made by superimposing the heat-sealing layers and heat-bonding the peripheral edges. In addition, such a packaging bag has been devised in various ways to facilitate opening. For example, a notch having an I, U, V shape or the like is formed on the outer edge of a joint (heat fusion portion) on the periphery of the packaging bag. And notches are provided. FIG. 6 shows a four-sided seal type packaging bag 100 in which a peripheral joint 101 is provided with a V notch 102 from the outer edge as an example.

Further, a packaging bag having an easy-opening property that tears a packaging bag straight and linearly when the packaging bag is torn from a notch is also known. For example, an easily-openable packaging bag in which a uniaxially stretched polyolefin film or a biaxially stretched polyester film that can be linearly torn is laminated on a base material layer or an intermediate layer to have tear linearity is known (for example, See Patent Document 1). Further, in a bag made of a laminated film provided with an outer surface layer, an intermediate layer and a thermosetting resin layer, a linear cut line for opening is formed in the intermediate layer of the laminated film constituting the back surface side of the bag. Also disclosed is an easy-to-open packaging bag having a tear linearity by forming a notch in at least one of both ends of the bag corresponding to both ends of the cut line (for example, Patent Document). 2).

By providing the packaging bag with an opening starting means such as a notch and the above-mentioned easy-opening means for the laminated body, the packaging bag is highly convenient for the user. However, in these conventional packaging bags 100, as shown in FIG. 6, when the bag is torn from the V notch 102 and opened, the cut portion is separated from the packaging bag 100 as a cut piece 103 and becomes dust, and once cut out. Since it is necessary to discard the piece 103, there is a problem that it is troublesome to take out the contents. Further, since the cut piece 103 is separated by opening, a part of the design provided in the packaging bag 100 is cut off, which impairs the original design and the design in consideration of the area of the cut piece 103. There is a problem that the degree of freedom such as the size of the design is limited.

Japanese Unexamined Patent Publication No. 10-168293 Japanese Unexamined Patent Publication No. 2001-18988

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a packaging bag in which no cut pieces are generated when the packaging bag is opened.

In order to achieve the above object, the present invention according to claim 1 is a packaging in which a gusset portion is provided on an upper portion of a bag main body portion, and an upper joint portion is provided on the peripheral edge and side joint portions are provided on both left and right sides. In the bag, the first sheet and the second sheet are arranged so as to face each other in the bag body, the gusset part is composed of the third sheet folded in half, and the third sheet folded in half is the bag body. It is arranged between the first sheet and the second sheet at the upper part of the portion with the folded portion on the lower side, and the peripheral edge is joined to the first sheet and the second sheet at the upper joint portion. The upper ends of the first sheet, the second sheet, and the third sheet folded in half are located at the upper ends of the upper joint portion, and the third sheet is placed in the folded portion of the third sheet. The packaging bag is provided with a notch to penetrate, and an opening joint portion in which the first sheet and the second sheet are detachably joined to each other below the folded portion.

The present invention according to claim 2 is characterized in that the left and right ends of the gusset portion are joined to each other in the packaging bag according to claim 1.

Since the packaging bag of the present invention can be opened by tearing the third sheet from the cut provided in the fold portion of the gusset portion and further peeling off the opening joint portion, no cut piece is generated at the time of opening.

It is a front view which shows the 1st Embodiment of the packaging bag which concerns on this invention. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is explanatory drawing explaining the gusset part of the 1st Embodiment of the packaging bag which concerns on this invention, and is the figure which shows the plane and the partial cross section seen in the state which expanded the gusset part of the upper part. It is a partial cross-sectional view explaining the opening method of the packaging bag which concerns on this invention. It is a front view which shows the 2nd Embodiment of the packaging bag which concerns on this invention. It is a front view which shows an example of the conventional packaging bag.

The above invention will be described in detail below with reference to drawings and the like.
FIG. 1 is a front view showing the first embodiment of the packaging bag according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a gusset portion of the first embodiment of the packaging bag according to the present invention. It is explanatory drawing to explain, and the figure which shows the plane and the partial cross section seen in the state where the upper gusset part was expanded, FIG. 4 is a partial sectional view explaining the opening method of the packaging bag which concerns on this invention, and FIG. 5 is a book. A front view showing a second embodiment of the packaging bag according to the invention, FIG. 6 is a front view showing an example of a conventional packaging bag, in which P1 and P2 are packaging bags, 1 is a bag body, and 2 is a gusset. 3 is the upper joint, 4 and 5 are the side joints, 6 is the planned lower joint, 7 is the opening joint, 7'is the opening joint peeling mark, 8 is the opening, and 9 is the cut. Notch 10 is the first sheet, 20 is the second sheet, 30, 30'is the third sheet, 31 is the fold, and 32 is the cut.

FIG. 1 is a front view showing a first embodiment of a packaging bag according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. Is provided, and an upper joint portion 3 is provided on the peripheral edge, and side joint portions 4 and 5 are provided on both the left and right sides, respectively. The bag body 1 is formed by having a first sheet 10 and a second sheet 20 having a heat-sealing layer (not shown) on the inner surface facing each other so that the heat-sealing layers face each other, and the gusset part 2 is at least on the inner surface. It is composed of a third sheet 30 provided with a heat-sealing layer (not shown), folded in half with the surface of the heat-sealing layer facing outward, and the folded third sheet 30 is folded in the upper part of the bag body 1. It is arranged between the first sheet 10 and the second sheet 20 with 31 as the lower side, and one surface of the heat-sealing layer of the third sheet 30 that is folded in half is the heat-sealing layer of the first sheet 10. The other surface of the heat-sealed layer of the third sheet 30 that is folded in half faces the heat-sealed layer of the second sheet 20, and the peripheral edge of the third sheet 30 is the upper joint portion 3 and the first sheet. It is joined to 10 and the second sheet 20.

The folded portion 31 of the third sheet 30 is provided with a cut 32 penetrating the third sheet 30, and the cut 32 is formed by a linear perforation line in the left-right direction of the third sheet 30. The lengths of the cut 32 and the non-cut may be appropriately designed according to the laminated structure of the third sheet 30 as long as the third sheet 30 can be torn by a finger by the opening method described later. The packaging bag P1 includes an opening joint 7 below the folded portion 31 of the third sheet 30 constituting the gusset portion 2, and the opening joint 7 heats the inner surfaces of the first sheet 10 and the second sheet 20. It is formed by joining the fused layers so that they can be peeled off. By providing the opening joint portion 7, the bag main body portion 1 can be sealed, and easy opening property can be imparted at the time of opening.

Next, the gusset portion 2 of the first embodiment of the packaging bag P1 according to the present invention will be described in detail with reference to FIG. FIG. 3 (a) is a plan view of the gusset portion 2 provided on the upper part of the packaging bag P1 in an expanded state, and FIG. 3 (b) is a partial cross-sectional view taken along line BB, FIG. 3 (c). Is a partial cross-sectional view taken along the line CC. As shown in FIG. 3A, the third sheet 30 constituting the gusset portion 2 has a rectangular shape, and a folded portion 31 that divides the gusset portion 2 into upper and lower parts is provided in the substantially center, and the folded portion 31 is formed by the third sheet 30. A perforation line consisting of a cut 32 straddling both left and right ends is provided. As shown in FIG. 3B, an opening joint 7 is provided below the folded portion 31 of the gusset portion 2. The opening joint 7 is formed by the heat-sealing layers of the first sheet 10 and the second sheet 20 being detachably joined to each other. FIG. 3 (c) is a partial cross-sectional view of the side joint portion 4. In the gusset portion 2, one side of the third sheet 30 folded in half is joined to the first sheet 10 in a peelable manner, and the other side is the second. It is non-peelablely joined to the sheet 20. Other than that, the heat-sealed layers of the first sheet 10 and the second sheet 20 are joined to each other so as not to be peeled off to form the side joint portion 4. The side joint portion 5 is also formed in the same manner (not shown). As shown in FIG. 1, the lower end portion is opened as a lower joint portion to be formed 6 before the contents are sealed, and after the contents are filled, the lower end portion is joined to become the lower joint portion, and the contents are hermetically packaged. is there.

The first sheet 10, the second sheet 20, and the third sheet 30 used for the packaging bag P1 of the present invention will be described. As the base material layer of the first sheet 10, the second sheet 20, and the third sheet 30, a synthetic resin film having excellent mechanical, physical, chemical, and the like properties can be used, and for example, a polyester-based film can be used. , An unstretched film using a resin such as polyamide or polypropylene, or a stretched film stretched in the uniaxial or biaxial direction can be used, and the thickness of the film is as a base material. The thickness may be as long as it can be held to the minimum necessary for the strength, rigidity, etc. Further, the synthetic resin film used as the base material layer is usually printed on the inner layer side of the synthetic resin film, and printability is required. Therefore, a stretched film stretched in the uniaxial direction or the biaxial direction is used. Suitable. Further, the above-mentioned synthetic resin film coated with polyvinylidene chloride or an inorganic material such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, and zirconium oxide is formed on the base material layer to form a gas barrier property. A film with the above can also be used.

The intermediate layer is heat-sealed by the required quality required for the packaging bag P1, for example, the gas barrier property such as oxygen gas and water vapor gas, and / or the protective function required according to the contents such as light-shielding property. It can be provided between the layer and the base material layer. As the intermediate layer, for example, a metal foil such as aluminum, iron, copper, tin, a film such as polyvinyl alcohol, a saponified ethylene-vinyl acetate copolymer, or polyvinylidene chloride, or polyester, polyamide, polyethylene / polypropylene, or the like. -Polyester such as ethylene-propylene copolymer, film such as polyvinyl alcohol coated with polyvinylidene chloride, or inorganic substances such as aluminum, silicon oxide, aluminum oxide, indium oxide, tin oxide, zirconium oxide, etc. were deposited. A film or the like can be used. Further, the intermediate layer not only imparts the above-mentioned gas barrier property and / or light-shielding property, but also has, for example, mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, and heat resistance. Materials that can impart functions such as chemical resistance and impart light-shielding properties with the above-mentioned gas barrier properties and / or light-shielding properties, and polyolefins such as polyester, polyamide, polyethylene / polypropylene / ethylene-propylene copolymer, etc. It may be used in combination with a film such as. Further, a synthetic resin film used for the base material layer can also be used.

The heat-sealing layer may be a layer formed of a heat-adhesive resin that can be melted by heat and welded to each other. For example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear (linear) Low density polyethylene, polypropylene, ethylene-α olefin copolymer, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, ethylene -It can be formed of a resin consisting of one or more resins such as a methacrylic acid copolymer. In particular, a resin composition such as ethylene, which can stably obtain a low sealing strength with a low-temperature seal, has an easy peeling property, and can obtain a high sealing strength by a high-temperature sealing and a complete sealing property that is difficult to peel off, for example, ethylene. -Excluding component A, component B, propylene homopolymer, and propylene and propylene, which are selected from α, β-unsaturated carboxylic acid copolymers and their ionomers and have different melt flow rates as defined by JIS K7210. A resin composition such as component C selected from a copolymer with one or more α-olefins is preferable because the opening joint 7 can be easily formed.

When a film having a gas barrier property is used for the base material layer, the intermediate layer for imparting the gas barrier property and / or the light-shielding property may not be used, but the protection required for the contents is required. Depending on the function, for example, in order to impart functions such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, chemical resistance, etc., for example, polyester, polyamide, or polyethylene, A type or more of a film such as a polyolefin such as polypropylene or an ethylene-propylene copolymer can be combined and used as an intermediate layer.

The method of laminating the base material layer, the intermediate layer, and the heat-sealing layer is, for example, a dry lamination method of laminating using an adhesive for dry laminating such as urethane, or extruded lamination of laminating by hot melt extrusion of polyethylene resin or the like. The law can be used. Further, the cut 32 provided in the folded portion 31 of the third sheet 30 can be physically provided from the perforation line with a die roll having a predetermined shape. Further, it may be provided by laser processing.

The packaging bag P1 can be manufactured by using an existing self-supporting bag (standing pouch) bag making machine. For example, a wide sheet in which the first sheet 10 and the second sheet 20 are connected is separated into the first sheet 10 and the second sheet 20 by a slitter, and the heat-sealing layers are arranged so as to face each other at one end. The third sheet 30 folded in half with the heat-sealing layer on the outside is sandwiched so that the folded portion 31 faces the other end, and the third sheet 30 and the first sheet 10 and the third sheet 30 and the second sheet 20 are sandwiched. One end of the flow direction (the direction in which the side joints 4 and 5 face each other) is heat-bonded to form the upper joint portion 3 in the longitudinal direction, and then heat-bonded to a predetermined position in the flow direction to join for opening. Part 7 is formed. After that, heat-sealed portions are provided at equal intervals in the direction orthogonal to the flow direction, and the heat-sealed portions are cut so as to be substantially divided into two in the direction orthogonal to the flow direction. , And the upper joint portion 3 in the lateral direction can be provided to manufacture the packaging bag P1. The opening joint portion 7 has a lower heat bonding temperature than the upper joint portion 3 and the side joint portions 4 and 5, and is heat-bonded so as to be peelable. The upper joint portion 3, the side joint portions 4, and 5 have a higher heat bonding temperature than the opening joint portion 7, and are heat-bonded so as not to be peeled off. It is preferable to trim the outer edge of the upper joint portion 3 and the outer edge of the opening portion (the lower joint portion to be formed 6). Further, the packaging bag P1 can be arranged in two rows by having two surfaces in the flow direction.

FIG. 4 is a partial cross-sectional view illustrating a method of opening the packaging bag P1 according to the present invention, and shows a cross section at a position corresponding to the line AA of FIG. One side and the other side facing each other with the fold portion 31 of the third sheet 30 in the longitudinal direction of the gusset portion 2 as the center are picked with fingers, and the fingers are pushed into the fold portion 31 while pulling in opposite directions. When the non-cut laminate adjacent to the cut 32 of the third sheet 30 cannot withstand the pushing strength, cutting of the laminate is started from the cut 32, the cutting propagates along the perforation line, and the third sheet 30 breaks. Further, when the third sheet 30 is continuously pulled in opposite directions, the opening joint portion 7 is peeled off and the packaging bag P1 is opened. In FIG. 4, the opening 8 formed by opening and the peeling mark 7'of the peeled joint portion for opening can be seen. The packaging bag P1 of the present invention does not generate a cut piece 103 (see FIG. 6) that is generated when the conventional packaging bag is opened, and as a result, the areas of the first sheet 10 and the second sheet 20 of the packaging bag P1 are increased. Since it does not decrease, the entire surface of the first sheet 10 and the second sheet 20 can be designed, and the degree of freedom in design is expanded.

5A and 5B are front views showing a second embodiment of the packaging bag according to the present invention, FIG. 5A is a front view of the packaging bag P2 of the second embodiment, and FIG. 5B is a third sheet 30. It is a development view of'. The packaging bag P2 of the second embodiment is characterized in that the left and right ends of the gusset portion 2 are joined as shown in FIG. 5 (a). As shown in FIG. 5 (b), the third sheet 30'is divided into upper and lower parts by a cut 32 formed in the left-right direction along the folded portion 31. Two semicircular notches 9 are provided at the left and right ends of the bisected third sheet 30', respectively. The notch 9 is formed at a position where the upper and lower notches 9 substantially overlap when the third sheet 30'is folded in half at the folded portion 31, and the arcuate portion of the notch 9 is the inner edge of the side joint portions 4 and 5. It is formed in a position where it fits more outward. The third sheet 30'is folded in half at the folding portion 31 with the heat fusion layer on the outside, inserted between the first sheet 10 and the second sheet 20, and the heat fusion layer of the third sheet 30'and the first sheet 30'. The sheets 10 and the second sheet 20 are heat-bonded in a state of facing each other, and are bonded at the upper joint portion 3. In the notch 9 of the third sheet 30, since the heat-sealing layers of the first sheet 10 and the second sheet 20 are directly heat-bonded (bonded), both ends are closed, and when the third sheet is opened, the third sheet is closed. When 30'is pulled in opposite directions, it becomes spindle-shaped. Others are the same as those in the first embodiment, and the same reference numerals are given and the description thereof will be omitted. Since the left and right ends of the third sheet 30'do not expand, the packaging bag P2 of the second embodiment looks good when the product is displayed at the store.

As another method of joining the left and right ends of the gusset portion 2, there is a method of using a film having thermal adhesiveness in the base material layer in the configuration of the laminated body of the third sheet 30. For example, heat-bonding is performed using a biaxially stretched film such as a polyester film, a polypropylene film, or a nylon film coated with polyvinylidene chloride resin or an acrylic resin, or a heat-sealing biaxially stretched polypropylene manufactured by a co-pressing method. The configuration may be such that the surface having the property is on the outside and the layers are laminated. In addition, a heat sealant containing a resin such as acrylic, polyolefin, or rubber as a main component is part-coated on the regions corresponding to the side joints 4 and 5 at both ends of the third sheet 30 in the left-right direction to join the joints. May be provided. In this case, since the outer surfaces of the third sheet 30 are heat-bonded to each other, it is not necessary to provide the notch 9.

It should be noted that the embodiments described so far have given typical examples of the packaging bag according to the present invention, and the packaging bag according to the present invention is not limited to this, and the gist of the present invention is described. Anything that does not deviate is included in the present invention.

[Example 1]
A biaxially stretched polyethylene terephthalate film (PET) with a thickness of 12 μm is used as the base material layer, and a sealant film (TOK) with a thickness of 50 μm that can control easy peeling and complete sealing by adjusting the sealing temperature is used as the heat-sealing layer. Gravure printing (GR) was performed on one side of the polyethylene, a coating liquid of a urethane-based anchor coating agent was applied to the printed surface, dried to provide an anchor coating layer (AC), and then the AC surface of PET and TOK were thermally melted. Low-density polyethylene (PE) was extruded from a T-die to a thickness of 20 μm and laminated by a sandwich lamination method to prepare a laminate having a structure of <PET 12 μm / GR / AC / PE 20 μm / TOK 50 μm>. The thickness of the sealant film (TOK) is preferably 30 to 100 μm.

The laminated body is used as the first sheet 10, the second sheet 20, and the third sheet 30, and the packaging bag P1 (outer dimensions: vertical length 120 mm × horizontal length 90 mm, folding width of the gusset portion 2: 15 mm) shown in FIG. (Expanded width: 30 mm), seal width of upper joint and side joint: 5 mm) were produced. The opening joint 7 was provided with a seal width of 10 mm from a position 18 mm below the upper end. The folded portion 31 of the third sheet 30 is provided with a perforation line having a length of the cut 32 of 0.3 to 2.0 mm and a distance (non-cut) of 0.3 to 2.0 mm from the adjacent cut 32. The heat seal conditions are as follows.
(Heat seal condition)
<Upper joint and side joint>
Sealing temperature (° C): 170 ° C or higher Sealing pressure (N / cm ² ): 9.8
Sealing time (seconds): 1.0
<Joint for opening>
Sealing temperature (° C): 160 ° C or less Sealing pressure (N / cm ² ): 9.8
Sealing time (seconds): 1.0
Further, the upper joint portion and the side joint portion obtained under the above heat seal conditions were 20 N / 15 mm or more, and the seal strength of the opening joint portion was 2 to 10 N / 15 mm.

With respect to the packaging bag P1 produced above, one side and the other side facing each other centering on the folded portion 31 of the third sheet 30 in the longitudinal direction of the gusset portion 2 are pinched with fingers, and the gusset is pulled while pulling in opposite directions. When opened from part 2, the third sheet 30 can be easily broken from the cut 32 along the perforation line, and the opening joint 7 can also be easily peeled off to open the packaging bag P1. It was.

P1, P2, 100 Packaging bag 1 Bag body 2 Gusset 3 Upper joint 4, 5 Side joint 6 Lower joint to be formed 7 Opening joint 7'Opening joint peeling mark 8 Opening 9 Notch 10 1st sheet 20 2nd sheet 30, 30'3rd sheet 31 Folded part 32 Cut 101 Peripheral joint 102 V notch 103 Cut piece

Claims (2)

A packaging bag in which a gusset portion is provided on the upper part of the bag body portion, and an upper joint portion is provided on the periphery and side joint portions are provided on both the left and right sides.
The main body of the bag has the first sheet and the second sheet facing each other.
The gusset part consists of a third sheet folded in half,
The third sheet folded in half is arranged on the upper part of the bag main body portion between the first sheet and the second sheet with the folded portion as the lower side, and the peripheral edge is the first one at the upper joint portion. It is joined to the sheet and the second sheet,
The upper ends of the first sheet, the second sheet, and the third sheet folded in half are located at the upper ends of the upper joint.
The folded portion of the third sheet is provided with a cut penetrating the third sheet.
A packaging bag characterized by having an opening joint portion in which the first sheet and the second sheet are detachably joined to each other below the folded portion. The packaging bag according to claim 1, wherein the left and right ends of the gusset portion are joined.

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